"Wandering Child" is one of my favorite songs, not only because the music is pretty, but because of the rising tension in the story. Also, it's the first time Christine called the Phantom "Angel of Music" since the Angel of Music reprise.
“…sometimes, I think I can still smell those flowers. How absurd! Here, five feet underground!” His eyes widen with confusion. “Why aren’t we in our mansion, Christine? And our wedding was so long ago… wasn’t it?